Stamp



FIG. 1 is a top, front and right side perspective view of a stamp showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view thereof; as viewed from the top, rear and left side and,

FIG. 9 is another perspective view thereof showing the design on a reduced scale and with environmental structure in broken lines that form no part of the claim. 

The ornamental design for a stamp, as shown and described. 